Currently toxicity data for iron (Fe) in seawater is limited; furthermore these data are of poor quality due to the importance of Fe solubility in test solutions being overlooked. This study characterised the solubility and lability of Fe(III) in seawater and then examined the effects of Fe(III) on the fertilisation success and larval survival of the tropical marine scleractinian corals Acropora spathulata and Platygyra daedalea. Here we present the first assessment of the effects of Fe on the early life stages of scleractinian corals. Concentrations of both soluble and labile forms of Fe were very low with dissolved Fe concentrations ≤ 0.195 mg/L in bioassay test solutions and chemical determinations revealing labile Fe concentrations ≤ 1.21 mg/L. For fertilisation experiments the EC50 value for total Fe was 25 mg/L for the most sensitive species P. daedalea, whilst the EC50 values for A. spathulata ranged between 40 to 66 mg/L. The LC50 value for P. daedalea larval survival was 47 mg/L Fe after 72 h exposure. Here we provide Fe toxicity data for tropical marine keystone species that could be used to help generate more reliable guideline values for Fe in marine waters. This article is protected by copyright. All rights reserved.
This research output has an Altmetric Attention Score of 2. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 17 November 2017.
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